US10551712B2 - Display apparatus switchable between display state and mirror state - Google Patents
Display apparatus switchable between display state and mirror state Download PDFInfo
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- US10551712B2 US10551712B2 US15/527,312 US201615527312A US10551712B2 US 10551712 B2 US10551712 B2 US 10551712B2 US 201615527312 A US201615527312 A US 201615527312A US 10551712 B2 US10551712 B2 US 10551712B2
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/163—Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/153—Constructional details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
- B60R1/02—Rear-view mirror arrangements
- B60R1/04—Rear-view mirror arrangements mounted inside vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
- B60R1/02—Rear-view mirror arrangements
- B60R1/08—Rear-view mirror arrangements involving special optical features, e.g. avoiding blind spots, e.g. convex mirrors; Side-by-side associations of rear-view and other mirrors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
- B60R1/12—Mirror assemblies combined with other articles, e.g. clocks
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/1506—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect caused by electrodeposition, e.g. electrolytic deposition of an inorganic material on or close to an electrode
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/153—Constructional details
- G02F1/155—Electrodes
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/153—Constructional details
- G02F1/157—Structural association of cells with optical devices, e.g. reflectors or illuminating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
- B60R1/12—Mirror assemblies combined with other articles, e.g. clocks
- B60R2001/1253—Mirror assemblies combined with other articles, e.g. clocks with cameras, video cameras or video screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/20—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of display used
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133553—Reflecting elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/1514—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect characterised by the electrochromic material, e.g. by the electrodeposited material
- G02F1/1523—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect characterised by the electrochromic material, e.g. by the electrodeposited material comprising inorganic material
- G02F1/1525—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect characterised by the electrochromic material, e.g. by the electrodeposited material comprising inorganic material characterised by a particular ion transporting layer, e.g. electrolyte
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F2001/164—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect the electrolyte is made of polymers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/44—Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/36—Micro- or nanomaterials
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/62—Switchable arrangements whereby the element being usually not switchable
Definitions
- the disclosure generally relates to the field of display apparatus, in particular, to a display apparatus switchable between a display state and a mirror state.
- a display apparatus switchable between a display state and a mirror state is needed. In other words, it is needed that an image-displaying surface of a display apparatus can, in some cases, turn to a mirror having reflecting function.
- a typical one in these cases is an interior rearview mirror in a vehicle.
- a conventional interior rearview mirror is made of a mirror, by which the driver observes the environment behind the vehicle.
- passengers, luggage or the like hinder the rear windscreen so that the driver cannot observe the environment behind the vehicle via the interior rearview mirror. This results in inconvenience or even safe problems. Therefore, more and more attention is given to replacement of traditional interior rearview mirrors by display-type interior rearview mirrors.
- a display-type interior rearview mirror Generally, observing the environment behind the vehicle by a display-type interior rearview mirror comes into practice by a camera installed at rear of the vehicle.
- the camera can be installed outside the rear windscreen, so that the field of the vision of the camera will not be blocked.
- a traditional interior rearview mirror is still needed. For instance, when the driver wishes to observe the situation on the back seats via the interior rearview mirror, an interior rearview camera installed outside the vehicle is insufficient to provide this function.
- a display apparatus switchable freely between a mirror state (mirror mode) and a display state is needed.
- the mirror mode should have low power consumption.
- a technique using translucent reflective mirror or a technique adding a polarized light-selecting unit and a polarization axis-changeable unit is typically used. These two techniques can hardly achieve bright image and bright mirror, and the power consumption at the mirror state is relatively high.
- electrochromic smart windows which can change the color thereof according to the user's requirement and thus further adjust the sunlight irradiation level smartly, in order to decrease the energy consumption for controlling temperature indoors.
- the patent application CN104614913A discloses a flexible stickable electrochromic device switchable between a mirror state and a transparent state. That device is applied in portholes of an airplane, glass for daylighting, walls of a building, etc.
- a display apparatus comprises a display; and a field-induced visibility-controlling layer provided on light-outgoing side of the display, wherein the field-induced visibility-controlling layer can be switched between a transparent state and a mirror state by adjusting voltage applied, such that when the field-induced visibility-controlling layer is in the transparent state, the display is visible through the field-induced visibility-controlling layer; and when the field-induced visibility-controlling layer is in the mirror state, the display is shielded by the mirror formed of the field-induced visibility-controlling layer.
- a display apparatus By means of combining a display and a field-induced visibility-controlling layer which can be electrically switched between a transparent state and a mirror state, a display apparatus switchable freely between a function of displaying an image and a function of mirror is provided.
- the rapid switch between two states of the field-induced visibility-controlling layer can be achieved by applying an electrical field to a transparent composition to form a mirror layer, and applying a reversed electrical field to the mirror layer to form the transparent composition.
- the field-induced visibility-controlling layer comprises two transparent conductive layers and an electrolyte layer sandwiched therebetween; and a transparent insulating layer is provided between the display and the field-induced visibility-controlling layer; wherein different voltages are applied through the two transparent conductive layers to the electrolyte layer, such that the field-induced visibility-controlling layer is switched between a transparent state and a mirror state.
- the display may be formed by a liquid crystal display panel and a back lighting module.
- the display may also be other displays applicable for the structure of the present disclosure.
- the transparent insulating layer has a thickness of 100-300 ⁇ m.
- the transparent insulating layer may have a thickness of about 200 ⁇ m. Such a thickness not only ensures that there is no interference between the field-induced visibility-controlling layer and the display, but also does not weaken displaying brightness and performance apparently.
- the transparent insulating layer is made of polymethyl methacrylate (PMMA).
- the electrolyte layer is a sol formed by dissolving a silver ion-containing inorganic salt, a brominating agent and a catalyst in an organic solvent.
- the silver ion-containing inorganic salt is AgNO 3
- the brominating agent is tetra-n-butylammonium bromide (TBABr), sodium bromide, potassium bromide or dimethylbromosulfonium bromide, more specifically TBABr
- the catalyst is CuCl 2
- the organic solvent is DSMO.
- the concentration ranges thereof are as follows. AgNO 3 concentration is 40-60 mM, TBABr concentration is 200-300 mM, and CuCl 2 concentration is 8-12 mM. In one specific embodiment, AgNO 3 concentration is about 50 mM, TBABr concentration is about 250 mM, and CuCl 2 concentration is about 10 mM.
- the thicknesses of the layers are as follows.
- the thickness of the transparent conductive layer is 80-120 nm, the thickness of the electrolyte layer is 400-600 ⁇ m. And more specifically, the thickness of the transparent conductive layer may be about 100 nm, the thickness of the electrolyte layer may be about 500 ⁇ m.
- Such configuration of layer thicknesses achieves good performance either in the transparent state or in the mirror state.
- the voltage for switching from the transparent state to the mirror state is 1 V to 4 V and the switch time is 2 s or less; and the voltage for switching from the mirror state to the transparent state is ⁇ 1 V to ⁇ 4 V and the switch time is 2 s or less.
- the switch time herein represents the response time required from the beginning of applying voltage to the accomplishment of the switch between the transparent state and the mirror state. Such a combination of the voltage and the switch rate can meet the requirements for rapid switching and for low energy consumption at the same time.
- the display apparatus has a control means allowing the on/off state of the display correspondingly matching the transparent/mirror state of the field-induced visibility-controlling layer.
- control means allowing the on/off state of the display correspondingly matching the transparent/mirror state of the field-induced visibility-controlling layer.
- control means allowing the on/off state of the display correspondingly matching the transparent/mirror state of the field-induced visibility-controlling layer includes: a control device automatically turning off or turning on the display according to the mirror state or the transparent state of the field-induced visibility-controlling layer; or, a control device automatically applying an appropriate voltage to change the field-induced visibility-controlling layer into the mirror state or the transparent state when the display is turned off or turned on; or, a circuit, which can manually switch the states of the display and the field-induced visibility-controlling layer at the same time by same switch in a one-touch manner.
- control means comprises a control module for field-induced visibility-controlling layer and a sensing module, and the control module and a circuit driver of a liquid crystal display module are connected by the sensing module.
- the display apparatus is an interior rearview mirror, which displays an image coming from a camera shooting the environment behind the vehicle or displays a mirror.
- the mirror in the interior rearview mirror, the mirror is not parallel to the light-outgoing surface of the display, such that when the interior rearview mirror is installed in a vehicle, the light-outgoing surface of the display substantially right against a driver, and the mirror is positioned to enable the driver to observe an environment behind the vehicle via the mirror.
- FIG. 1 shows a structure of an example of a display apparatus of the disclosure.
- FIG. 2 shows a structure of an example of a display apparatus of the disclosure, which is in a mirror state.
- FIG. 3 shows a structure of an example of a display apparatus of the disclosure, which is in a transparent state.
- FIG. 4 is a schematic drawing of an example of a display apparatus of the disclosure, in which the light-outgoing surface of the display is not parallel to the mirror.
- FIG. 5 is a schematic drawing of an example of a display apparatus having a control means of the disclosure.
- FIG. 6 is a schematic drawing of one embodiment of the display apparatus of FIG. 5 .
- the disclosure provides a display apparatus, which comprises a display and a field-induced visibility-controlling layer provided on light-outgoing side of the display, wherein the field-induced visibility-controlling layer can be switched between a transparent state and a mirror state by adjusting the applied voltage.
- the field-induced visibility-controlling layer When the field-induced visibility-controlling layer is in the transparent state, the observer can watch the image displayed by the display through the transparent field-induced visibility-controlling layer, and the brightness of the image seen is substantially not influenced by the field-induced visibility-controlling layer.
- the field-induced visibility-controlling layer is in the mirror state, it forms a bright mirror between the observer and the display, such that the display apparatus serves as a reflective mirror. At this time, the display is invisible for the observer.
- the display is a liquid crystal display.
- the display 100 comprises a liquid crystal display panel and a back lighting module 9 , wherein the liquid crystal display panel comprises a first substrate 6 , a second substrate 8 provided oppositely thereto, and a liquid crystal layer 7 sandwiched between the first substrate and the second substrate, and wherein a field-induced visibility-controlling layer 200 is provided on the first substrate (upper substrate) 6 , i.e. on the light-outgoing side of the display 100 .
- the relative size relationship and relative position relationship for respective layers in the drawings are only schematic, not for purpose of limitation.
- the relative position of the field-induced visibility-controlling layer 200 with respect to the light-outgoing surface of the display 100 is not limited, as long as the field-induced visibility-controlling layer 200 , when it is in the mirror state, can shield the display 100 .
- the position of the layer 200 should be adjusted, such that it enables the driver to observe the environment behind the vehicle clearly when it is in the mirror state. At this time, the mirror of the field-induced visibility-controlling layer 200 will not be right against the driver.
- the light-outgoing surface of the display 100 behind the field-induced visibility-controlling layer 200 should be substantially right against the driver, so as to provide an optimal display effect to the driver, in particular, for those display types having a limited angle of view for observation.
- the field-induced visibility-controlling layer 200 may be not completely parallel to the light-outgoing surface of the display 100 , as shown in FIG. 4 .
- substantially right against a driver herein, it means that the driver can watch the display 100 normally. As often occurred in driving practice, the driver may adjust the angle of the mirror slightly, in order to observe better the environment behind the vehicle.
- the field-induced visibility-controlling layer 200 may also be parallel to the light-outgoing surface of the display 100 , in particular in other uses. Those skilled in the art can adjust the specific relative position of the field-induced visibility-controlling layer 200 with respect to the display 100 , according to requirements. Additionally, of course, the relative size of the field-induced visibility-controlling layer 200 with respect to the display 100 may also be adjusted specifically, according to the practical requirements for the mirror state and the display state (the transparent state).
- the field-induced visibility-controlling layer 200 can be fixed to the display 100 by known mechanical connection. The fixing manner is not limited, as long as it does not adversely influence the effect of the present disclosure.
- the field-induced visibility-controlling layer 200 comprises three main parts, i.e. an upper transparent conductive layer 2 and a lower transparent conductive layer 4 , and an electrolyte layer 3 sandwiched between the upper transparent conductive layer 2 and the lower transparent conductive layer 4 .
- a transparent insulating layer 5 may be further provided between the liquid crystal display panel and the transparent conductive layer 4 .
- the transparent conductive layer 2 may be covered by a glass substrate 1 thereon.
- the transparent conductive layers 2 , 4 as well as the transparent insulating layer 5 may be formed by physical vapor deposition, such as magnetron sputtering, or by low temperature deposition in CVD manner.
- the side of the transparent conductive layer 4 against the electrolyte is smooth and intact, so as to facilitate the formation of good mirror thereon.
- the material of the electrolyte layer 3 may be a sol formed by mixing and dissolving a silver ion-containing inorganic salt (e.g. AgNO 3 ), a brominating agent (e.g. TBABr) and a catalyst (e.g. CuCl 2 ) in an organic solvent (e.g. DMSO, etc.) homogeneously.
- a sealant e.g. AgNO 3
- a brominating agent e.g. TBABr
- a catalyst e.g. CuCl 2
- an additive in an appropriate amount may be incorporated, as long as it does not adversely influence the function of the field-induced visibility-controlling layer 200 of the present disclosure.
- PVB polyvinyl butyral
- an additive in an appropriate amount may be incorporated, as long as it does not adversely influence the function of the field-induced visibility-controlling layer 200 of the present disclosure.
- PVB polyvinyl butyral
- the display 100 may be an ordinary display. When it is necessary to save space, a flat panel display is preferred.
- a preferable example of the display 100 is a liquid crystal display panel having a back lighting module 9 .
- the field-induced visibility-controlling layer 200 switches the displaying states by using an electrical field.
- a transparent insulating layer 5 may be provided between the field-induced visibility-controlling layer 200 and the display 100 . As shown in FIG. 1 , the transparent insulating layer 5 separates the transparent conductive layer 4 of the field-induced visibility-controlling layer 200 from the surface of the display 100 , so that the current on the transparent conductive layer 4 is not influenced by the surface of the display 100 , and does not influence the surface of the display 100 .
- the material of the transparent insulating layer 5 may be an organic transparent insulating material, in particular, PMMA.
- the thickness range is 100-300 ⁇ m, for instance about 200 ⁇ m.
- PMMA has very excellent transmittance for light, has almost no influence on the transmission of the light of the display. Further, it also has relatively low cost, good insulating ability, mechanical strength, corrosion resistance and workability, and is very suitable for being used as the material for the transparent insulating layer of the present disclosure.
- the field-induced visibility-controlling layer 200 consists of two transparent conductive layers 2 , 4 and an electrolyte layer 3 sandwiched therebetween.
- the transparent conductive layer 2 or 4 serves as the wall of the container containing the electrolyte, and meanwhile it is connected to a voltage source and serves as an electrode plate.
- the transparent conductive layer 4 also serves as a substrate for forming the mirror layer.
- the transparent conductive layer 2 or 4 may be made of ITO (indium tin oxide), FTO (fluorine-doped tin oxide), AZO (aluminum zinc oxide), silver nanowires, etc. Among them, ITO is used in one embodiment.
- the chemical composition of the electrolyte layer 3 provides the function of switching the state.
- silver nitrate may be used as the silver ion-containing inorganic salt.
- Addition to tetra-n-butylammonium bromide, sodium bromide, potassium bromide and dimethylbromosulfonium bromide may also be used as the brominating agent.
- Copper chloride may be used as the catalyst.
- Dimethyl sulfoxide (DMSO) may be used as the organic solvent.
- the composition of the electrolyte layer 3 is as follows. AgNO 3 has a concentration of 40-60 mM, TBABr has a concentration of 200-300 mM, and CuCl 2 has a concentration of 8-12 mM.
- a method for formulating the electrolyte is dissolving 2.5 mmol TBABr, 0.1 mmol CuCl 2 and 0.5 mmol AgNO 3 in 10 mL DMSO. PVB may also be added to the above-mentioned mixture. This formulation meets the following requirements at the same time: relatively low voltage, sufficient transparency in the transparent state, sufficient reflecting ability in the mirror state, sufficiently short switch time, etc.
- the periphery of the electrolyte layer 3 and the gap between the transparent conductive layers 2 , 4 are sealed by a sealant.
- the sealant may be a resin, or the like.
- thicknesses of the respective layers may be as follows.
- the transparent conductive layer 2 or 4 has a thickness of 80-120 nm, for instance about 100 nm, and the electrolyte layer 3 has a thickness of 400-600 ⁇ m, for instance about 500 ⁇ m.
- the transparent conductive layer 4 (or transparent conductive layer A) is electrical grounded, and when a positive voltage is applied to the transparent conductive layer 2 (or transparent conductive layer B), the silver ion-containing inorganic salt in the sol electrolyte layer is subjected to the reduction reactions as shown in formulae (1) and (2), under the action of the electrical field: Ag + +n Br ⁇ ⁇ AgBr n 1-n (1) AgBr n 1-n +e ⁇ ⁇ Ag+ n Br ⁇ (2)
- the external power provides the electron (e ⁇ ), and the brominating agent provides Br ⁇ , and the Ag + therein is reduced to metal Ag nanoparticles, which are deposited on the flat inner side of the transparent conductive layer 4 and form a smooth mirror 10 , which has high reflectivity against light, as shown in FIG. 2 .
- the light of the liquid crystal display cannot pass the field-induced visibility-controlling layer 200 .
- the field-induced visibility-controlling layer 200 is in the mirror state.
- the electrical field is reversed.
- Metal Ag is subjected to oxidation reaction, and loses electrons (e ⁇ ).
- the metal Ag layer formed by electrodeposition is decomposed and forms Ag + dispersed into the sol electrolyte.
- the field-induced visibility-controlling layer 200 turns back to the transparent state, which has high transmittance and allows light to pass, as shown in FIG. 3 .
- the state of the field-induced visibility-controlling layer 200 is controlled by voltage. In the case that no voltage is applied, the field-induced visibility-controlling layer 200 is in the stable transparent state. In order to keep the field-induced visibility-controlling layer 200 in a mirror state, a sustained positive voltage is needed to be applied. When the positive voltage is removed, the field-induced visibility-controlling layer 200 will gradually turn back to the transparent state from the mirror state. In order to switch the mirror state to the transparent state more rapidly, a negative voltage can be applied appropriately, so that the field-induced visibility-controlling layer 200 becomes transparent more rapidly.
- the voltage during the time period of switching the states (for example, switching from the transparent state to the mirror state) and the voltage during the time period of keeping the state (for example, keeping in the mirror state) may be different.
- a relatively high voltage is applied, so that the deposited silver layer continuously becomes thicker.
- a relatively lower voltage may be applied instead, to keep the deposition balance of silver, thereby saving energy.
- the applied voltage should not be too high, and meanwhile, for applicability purpose, it should be ensured that it takes relatively short time for the switch between the states of the field-induced visibility-controlling layer 200 .
- the voltage during the switch from the transparent state to the mirror state is 1-4 V, and the switch time is 2 s or less; and the voltage during the switch from the mirror state to the transparent state is ⁇ 1- ⁇ 4 V, and the switch time is 2 s or less.
- the absolute value of the switch voltage is less than 2V. Then, the energy required during the switch is relatively low, the current required for keeping the transparent state or the mirror state is relatively small, and the power consumption is relatively low.
- the display apparatus has a control means 300 allowing the on/off state of the display 100 correspondingly match the transparent/mirror state of the field-induced visibility-controlling layer 200 , as shown in FIG. 5 .
- This purpose may be achieved by various manual or automatic control devices, for example, a control device automatically turning off or turning on the display 100 according to the mirror state or the transparent state of the field-induced visibility-controlling layer 200 ; or a control device automatically applying an appropriate voltage to change the field-induced visibility-controlling layer 200 into the mirror state or the transparent state when the display 100 is turned off or turned on; or a circuit, which is designed to manually switch the states of the display 100 and the field-induced visibility-controlling layer 200 at the same time by same switch in a one-touch manner.
- a control device automatically turning off or turning on the display 100 according to the mirror state or the transparent state of the field-induced visibility-controlling layer 200 ; or a control device automatically applying an appropriate voltage to change the field-induced visibility-controlling layer 200 into the mirror state or the transparent state when the display 100 is turned off or turned on; or a circuit, which is designed to manually switch the states of the display 100 and the field-induced visibility-controlling layer 200 at the same time by same switch in a one-touch
- the liquid crystal display panel and the backlighting module may be shut down, and only the field-induced visibility-controlling part is turned on. This can save energy.
- the state of the field-induced visibility-controlling layer 200 can be automatically adjusted by controlling the voltage, by means of a combination of a sensor, a data processor and the like.
- FIG. 6 shows a specific exemplary embodiment, in which the control means 300 may comprise a control module 310 for field-induced visibility-controlling layer and a sensing module 320 .
- the control module 310 for field-induced visibility-controlling layer is set, which module may control the field-induced visibility-controlling layer 200 according to an input signal.
- the control module 310 for field-induced visibility-controlling layer and a circuit driver of a liquid crystal display module is connected by the sensing module 320 , which can sense the working voltage of the liquid crystal display module, and input it as the input signal to the control module 310 for field-induced visibility-controlling layer.
- the input to the control module 310 produces a corresponding signal 0 ; and when the liquid crystal display module stop working, i.e. when VDD is 0, the input to the control module 310 produces a corresponding signal 1 .
- the control module 310 for field-induced visibility-controlling layer sends the turn-on signal 1 and the turn-off signal 0 (corresponding to turning on the mirror state and returning to the transparent state respectively) to the power-controlling part of the field-induced visibility-controlling layer 200 .
- the mirror state of the field-induced visibility-controlling layer 200 is automatically turned on by the sensing apparatus; and when the liquid crystal display module is turned on, the transparent state of the field-induced visibility-controlling layer 200 automatically comes back by the sensing apparatus.
- the display apparatus of the disclosure is an interior rearview mirror in a vehicle.
- the display 100 in the display apparatus displays image coming from the camera, which is installed at rear of the vehicle, for example, outside the rear windscreen.
- the camera and the circuit associated with the display are shut off meanwhile, to save electric energy.
- a display apparatus was produced by steps of:
- ITO transparent conductive layer 2 and transparent conductive layer 4 each having a thickness of 400-600 nm on the PMMA insulating layer 5 and on the upper substrate 1 by magnetron sputtering respectively, and extracting out electrodes; 3) dissolving 2.5 mmol TBABr, 0.1 mmol CuCl 2 and 0.5 mmol AgNO 3 in 10 mL DMSO, and adding PVB having a mass fraction of 10% into the formulated electrolyte, to make it come to a gel state; 4) assembling the upper substrate 1 coated with ITO transparent conductive layer 2 , the display module coated with PMMA insulating layer 5 and ITO transparent conductive layer 4 , and DMSO-based electrolyte in the gel state, to form a field-induced visibility-controlling layer 200 having a sandwich structure.
- a display apparatus switchable freely between a display state and the mirror state was formed by the above-mentioned steps.
- the display apparatus produced in Example 1 was used. When no voltage was applied, the field-induced visibility-controlling layer 200 is in the stable transparent state.
- the transparent conductive layer 4 (or transparent conductive layer A) was grounded, and a positive voltage of 1-3 V was applied to the transparent conductive layer 2 (or electrode B), and after a time of less than 2 s, the field-induced visibility-controlling layer 200 was in the mirror state, as shown in FIG. 2 . At that time, the display apparatus was a mirror for an observer, and the display 100 behind the field-induced visibility-controlling layer 200 could not be observed.
- the field-induced visibility-controlling layer 200 gradually and slowly turned back to the transparent state from the mirror state, as shown in FIG. 3 .
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Abstract
Description
Ag+ +nBr−→AgBrn 1-n (1)
AgBrn 1-n +e −→Ag+nBr− (2)
3) dissolving 2.5 mmol TBABr, 0.1 mmol CuCl2 and 0.5 mmol AgNO3 in 10 mL DMSO, and adding PVB having a mass fraction of 10% into the formulated electrolyte, to make it come to a gel state;
4) assembling the
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CN201610243719.7A CN105807526A (en) | 2016-04-18 | 2016-04-18 | Display device capable of being switched between display state and mirror surface state |
CN201610243719.7 | 2016-04-18 | ||
CN201610243719 | 2016-04-18 | ||
PCT/CN2016/101863 WO2017181621A1 (en) | 2016-04-18 | 2016-10-12 | Display device capable of switching between display state and mirror surface state |
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US20180252978A1 US20180252978A1 (en) | 2018-09-06 |
US10551712B2 true US10551712B2 (en) | 2020-02-04 |
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CN105807526A (en) * | 2016-04-18 | 2016-07-27 | 京东方科技集团股份有限公司 | Display device capable of being switched between display state and mirror surface state |
KR102569964B1 (en) * | 2016-06-24 | 2023-08-23 | 삼성디스플레이 주식회사 | Smart window |
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US10596970B2 (en) * | 2017-08-25 | 2020-03-24 | Panasonic Automotive Systems Company Of America, Division Of Panasonic Corporation Of North America | Auto-switch display intelligent rearview mirror system |
CN109991790A (en) | 2017-12-29 | 2019-07-09 | 中华映管股份有限公司 | Electric-controlled type light valve and display device |
EP3896678A4 (en) * | 2018-12-11 | 2022-08-17 | Agc Inc. | Transparent glass provided with transparent display |
CN110208980A (en) * | 2019-05-14 | 2019-09-06 | 深圳市华星光电技术有限公司 | Liquid crystal display |
CN111338146B (en) | 2020-04-09 | 2021-04-02 | Tcl华星光电技术有限公司 | Backboard, dimming method thereof and display device |
IT202000023692A1 (en) * | 2020-10-20 | 2022-04-20 | Ayoube Jarmouny | TRANSPARENT GLASS WITH PHOTOCHROMIC EFFECT |
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